Which of the following expressions are equivalent to (9 7/8 + 2 4/5)-1/2
A)9 7/8 + (2 4/5 -1/2)
B)9 7/8 + 2 4/5 + (-1/2)
C)9 7/8 - (-2 4/5)-(1/2)
D)-(-9 7/8 + 2 4/5) - 1/2
E)9 7/8 - (-2 4/5 - 1/2)